diff options
Diffstat (limited to 'libc/sysdeps/linux/arm/mmap64.S')
| -rw-r--r-- | libc/sysdeps/linux/arm/mmap64.S | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/arm/mmap64.S b/libc/sysdeps/linux/arm/mmap64.S index ba8cb2fca..73d6b51ce 100644 --- a/libc/sysdeps/linux/arm/mmap64.S +++ b/libc/sysdeps/linux/arm/mmap64.S @@ -20,6 +20,7 @@ #define _ERRNO_H #include <bits/errno.h> #include <sys/syscall.h> +#include <bits/arm_asm.h> #if defined __UCLIBC_HAS_LFS__ && defined __NR_mmap2 @@ -28,9 +29,46 @@ .global mmap64 .type mmap64,%function .align 2 -mmap64: #ifdef __ARM_EABI__ +#if defined(THUMB1_ONLY) +.thumb_func +mmap64: +#ifdef __ARMEB__ +/* Offsets are after pushing 3 words. */ +# define LOW_OFFSET 12 + 8 + 4 +# define HIGH_OFFSET 12 + 8 + 0 +#else +# define LOW_OFFSET 12 + 8 + 0 +# define HIGH_OFFSET 12 + 8 + 4 +#endif + push {r4, r5, r6} + ldr r6, [sp, $LOW_OFFSET] + ldr r5, [sp, $HIGH_OFFSET] + lsl r4, r6, #20 @ check that offset is page-aligned + bne .Linval + lsr r4, r5, #12 @ check for overflow + bne .Linval + @ compose page offset + lsr r6, r6, #12 + lsl r5, r5, #20 + orr r5, r5, r6 + ldr r4, [sp, #8] @ load fd + DO_CALL (mmap2) + ldr r1, =0xfffff000 + cmp r0, r1 + bcs .Lerror + bx lr +.Linval: + ldr r0, =-EINVAL + pop {r4, r5, r6} +.Lerror: + push {r3, lr} + bl __syscall_error + POP_RET +.pool +#else /* !THUMB1_ONLY */ +mmap64: #ifdef __ARMEB__ # define LOW_OFFSET 8 + 4 /* The initial + 4 is for the stack postdecrement. */ @@ -45,6 +83,7 @@ mmap64: str r4, [sp, #-4]! movs r4, ip, lsl $20 @ check that offset is page-aligned mov ip, ip, lsr $12 + IT(t, eq) moveqs r4, r5, lsr $12 @ check for overflow bne .Linval ldr r4, [sp, $8] @ load fd @@ -52,6 +91,7 @@ mmap64: DO_CALL (mmap2) cmn r0, $4096 ldmfd sp!, {r4, r5} + IT(t, cc) #if defined(__USE_BX__) bxcc lr #else @@ -62,7 +102,8 @@ mmap64: mov r0, $-EINVAL ldmfd sp!, {r4, r5} b __syscall_error -#else +#endif +#else /* !__ARM_EABI__ */ stmfd sp!, {r4, r5, lr} ldr r5, [sp, $16] ldr r4, [sp, $12] |